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Table 5 Word-based feature sets in CRFs model.

From: CHEMDNER system with mixed conditional random fields and multi-scale word clustering

Word feature Wi-2, Wi-1, Wi, Wi+1, Wi+2
2-gram word feature Wi-2i-1, Wi-1i, Wii+1, Wi+1i+2
3-gram word feature Wi-3i, Wi-2i+1, Wi-1i+2, Wii+3
word cluster feature Ci-2, Ci-1, Ci, Ci+1, Ci+2
2-gram word cluster feature Ci-2i-1, Ci-1i, Cii+1, Ci+1i+2
3-gram word cluster feature Ci-3i, Ci-2i+1, Ci-1i+2, Cii+3